Her Majesty's Paymaster General or HM Paymaster General is a ministerial position in the United Kingdom. The Paymaster General was in charge of the Office of HM Paymaster General (OPG), which held accounts at the Bank of England on behalf of Government departments and selected other public bodies. Funds which were made available from the Consolidated Fund were then channelled into OPG accounts, from where they were used by the relevant body. OPG operated a full range of accounts and banking transaction services, including cheque and credit, BACS and CHAPS services for its customers via an electronic banking system. Integration of OPG accounts held with commercial banks was provided by the private company Xafinity Paymaster.

In 2008, the government announced that the Office of the Paymaster General would be incorporated into a new body, the Government Banking Service,[1] which also provides banking operations for HM Revenue & Customs and National Savings and Investments. Following the Bank of England's decision to withdraw from providing retail banking services,[2] retail banking services for the GBS are provided exclusively by the Royal Bank of Scotland and Citibank,[3] although the Bank of England still plays a role in managing the government's higher level accounts.[4]